src/bench/lockedpool.cpp

   1 // Copyright (c) 2016-2017 The Bitcoin Core developers
   2 // Distributed under the MIT software license, see the accompanying
   3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   4
   5 #include <bench/bench.h>
   6
   7 #include <support/lockedpool.h>
   8
   9 #include <iostream>
  10 #include <vector>
  11
  12 #define ASIZE 2048
  13 #define BITER 5000
  14 #define MSIZE 2048
  15
  16 static void BenchLockedPool(benchmark::State& state)
  17 {
  18     void *synth_base = reinterpret_cast<void*>(0x08000000);
  19     const size_t synth_size = 1024*1024;
  20     Arena b(synth_base, synth_size, 16);
  21
  22     std::vector<void*> addr;
  23     for (int x=0; x<ASIZE; ++x)
  24         addr.push_back(nullptr);
  25     uint32_t s = 0x12345678;
  26     while (state.KeepRunning()) {
  27         for (int x=0; x<BITER; ++x) {
  28             int idx = s & (addr.size()-1);
  29             if (s & 0x80000000) {
  30                 b.free(addr[idx]);
  31                 addr[idx] = nullptr;
  32             } else if(!addr[idx]) {
  33                 addr[idx] = b.alloc((s >> 16) & (MSIZE-1));
  34             }
  35             bool lsb = s & 1;
  36             s >>= 1;
  37             if (lsb)
  38                 s ^= 0xf00f00f0; // LFSR period 0xf7ffffe0
  39         }
  40     }
  41     for (void *ptr: addr)
  42         b.free(ptr);
  43     addr.clear();
  44 }
  45
  46 BENCHMARK(BenchLockedPool, 530);